For my novel, I was struggling to find rocket simulators that allowed setting an initial velocity for the rocket. Most of them presume a starting velocity of 0.

For my novel, I was struggling to find rocket simulators that allowed setting an initial velocity for the rocket. Most of them presume a starting velocity of 0. So, tangentially related, here is my calculator that allows users to provide an initial speed for the rocket before burning its onboard fuel: https://autonoma.ca/calculators/rocket/payload/ https://autonoma.ca/calculators/rocket/payload/ Source file containing most of the delta-v calculations: https://autonoma.ca/calculators/rocket/payload/Rocket.js https://autonoma.ca/calculators/rocket/payload/Rocket.js Being able to see all the TeX equations rendered with KaTeX on a single page is quite convenient.